/*
 * @(#)AWTFinalizer.java	1.11 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 *
 */

package sun.awt;

import sun.awt.AWTFinalizeable;
import java.security.AccessController;
import java.security.PrivilegedAction;

public class AWTFinalizer extends Thread {
    static AWTFinalizer theFinalizer;
    static AWTFinalizeable theFinalQueue;
    static {
        AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    theFinalizer = new AWTFinalizer();
                    return null;
                }
            }
        );
        theFinalizer.start();
    }
    private AWTFinalizer() {
        super("AWT-Finalizer");
        setPriority(MAX_PRIORITY - 1);
        setDaemon(true);
    }

    public void run() {
        while (true) {
            AWTFinalizeable q;
            synchronized (this) {
                while ((q = theFinalQueue) == null) {
                    try {
                        wait();
                    } catch (InterruptedException e) {}
                }
                theFinalQueue = null;
            }
            while (q != null) {
                q.doFinalization();
                q = q.getNextFinalizeable();
            }
        }
    }

    public static void addFinalizeable(AWTFinalizeable o) {
        synchronized (theFinalizer) {
            o.setNextFinalizeable(theFinalQueue);
            theFinalQueue = o;
            theFinalizer.notify();
        }
    }
}
